Question

the mean high temperature of the first four days of a week is 25 degree celsius whereas the means of the last four days is 25.2 celsius. if the means temperature of the whole week is 25.2 degree celsius then the temperature on the 4th day is

Answer 1

Answer:

24.4

Step-by-step explanation:

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Let the temperatures be T1, T2, ....T7

• (T1+T2+T3+T4)/4 = 25

• T1+T2+T3+T4 = 100 ....(1)

• (T4+T5+T6+T7)/4 = 25.2

• T4+T5+T6+T7 = 100.8 .....(2)

• Also, it is given that :

• (T1+ T2 +....+T7)/7 = 25.2

• T1+ T2 +....+T7 = 176.4 ....(3)

• (1)+(2) :

• (T1+ T2 +T3 + T4 + T5 + T6 + T7)+T4 =200.8

• 176.4 + T4 = 200.8 [From 3]
• T4 = 24.4